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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9be2e951c9778d103821eff7f7d8df9baae38b464c6ae64c595530c85f968c' 
  AND token = 'uRHH8iO9rB/uoUrjW8S8udinph928Sie5emzWF/PIZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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