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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847033d7f10f04c8090540fb6292eb1454aa28931762250442373119cf33c7a5' 
  AND token = 'jgDDg6ap1UQksPsyOyO9ckay4g00xI3TMjnquiX03Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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