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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f44cd052c8647da5f0766178c2b656e1f91f3bff08ff670bd86d30d71d4ebf96' 
  AND token = '014uZ7/wN2NYBfvvE6JmhJ4KIvVHQN21cuXp/7Z/mmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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