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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05bc40ed8cf44c8718e96666bf6910dd4da7458f27d85bc1f3d88cd8954600e' 
  AND token = 'QXIwwgX3m6ou8snQS+aDieiYJ6skPlhGGRb7zMP9QAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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