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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ecbd443c6e0047b1cafd4bc649549ffe27f810f4b7ad8c7adb714db58e8226' 
  AND token = 'Kh4RvVY5awJGGLPNSJdqcwfbK6lmSqIrPuzWW6J1wDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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