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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83bf04b255b722bfac8f1fd7e9ef4112fc3e6bdc99f8bc6a8efe2f93e62d7db' 
  AND token = 'yfYyyT3bQCcHxy7dsGrwDgAvvs51q9JUCONdtHEpJzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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