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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003e9d6b6c0db80b2bbb6093ed69187a1df36a8bce11b2153b362d968c41e01f' 
  AND token = 'Pb7jvSiVB0Ya5n+q732pyc+NkRvDwZlVISFYapmB668=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}