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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b4fcaa011f02f79edd9ee7b7000cf491d3a848d34e6d15f161960f3dc47e41' 
  AND token = 'UW7LqJPEz2TOAxrsl6nn3l/6sV2mh+zyS3rsX6u7ahE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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