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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbe38f7fa9bc53a83ac539b15e9798dc7c8ce1ae7699010a501fa04f7cfe34e' 
  AND token = 'bqhjXkj0Pa1zAKhqS8PJ9zdP2GedO6zkB3lBEVBbZyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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