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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf71f0856c3d6b011b32a57abc7f77485722a340837d64c7e83a4ed2143966e' 
  AND token = 'EuXlsQWtsGiGZDvMI2ANWJU73CTvCgVRtWqklRBluMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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