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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830c33fd057945b19c818d54f4ec9756ad0a1cc32a7bedd1dd9128da8c8ab611' 
  AND token = 'C7zmu9KVW0+HE5HwKadRcsIfhCT7qTzI4F3yQQEvGt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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