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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9506f96c8c80a438cab57c60634d7f183869c12f02be1fb9c7448437292df31f' 
  AND token = '4loSHudsidBatrbdMh4XVrPCOod9eLgkYkcF9/BLvoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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