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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1559932fa336e57fcc3c5c5eab198cb7e613b4e600ebb0af4b9bfc792f2392' 
  AND token = 'QkCMkWxTWkjiRCbXZBroxZnYnSpTb9iKM5wCxZbezC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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