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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db4651cf6452a715712e91119a744d865508004e5fa952b3c5688e1e2c8df84' 
  AND token = 't1IqEEn4u7epLQV62TfIWcOYzUyFSpDaXxPjroQny5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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