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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8105a72d285462850302f3b3c549ef6f3a7f704b0d87769d3861b353ea49cf5' 
  AND token = 'JtqfO9eRnX6pvm0dowdoU/nq99oU0qvBYj1MoIZ76AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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