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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94af66aab34592c4051bc369eed63fc61623900d4a79fd95c2f72b2588e22c7' 
  AND token = 'dlFchCe9a7JwK4Cxp7cottIafLQYfUqtK2zYcTZ2iZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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