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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fff7c966c7de7efef53c51ed4ddcd6d818b2697a597b62a7b9c5df5862a5b6' 
  AND token = 'HCbU/9RtfSi1xpA34jf47xFhY8z7nuHIoPzqZT4OA0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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