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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e128da4774e7fc548ca91369fe5a5baefc8164fd92282a1279ff50f07772b39e' 
  AND token = 'Y7GnPcDLwUx0QGR/yYStyajAYdsjEM4CkEHMUt43r20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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