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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106d35bec246eed937c80708742531b27ba75fd37cca12dd392be7760dad5c7c' 
  AND token = '5PqbCDzGokxK30cfwEq+dK5Bod/jx9ICfXdbx6VH0ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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