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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3224b3d5f700c5e2d2e4c0933891bcc073e92f200100c21c6bba05cfa30777' 
  AND token = 'Y9V2tf7riacAGMrKBD+oobnLz1+r/9olk2sjPZCl1mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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