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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e583f68ceca50ae5e1a116bc044c7faecd4575cdd08553cf7d32212b3d0eafc' 
  AND token = 'K8HV1IL+3XrMv+8pydv5OUK+dgxYiwZb5wffUO2MSgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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