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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbbb6d7fec1f3f617d6541ac505add14cad801b52912b2f4867eda3bc4b36a7' 
  AND token = 'coAHjxJv1ytguxKPHt0rEQ4WCcBl8Ly45RGPCpiURPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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