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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2648e233b79431a743486d8d7b50762d20a8a41e0b3f76e639d0cebb22b5849c' 
  AND token = 'nqgKwKUz21a9y8BzBpA8iKc6O0ej8O1hEQ6GKQf++uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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