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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8833b014546affd82e49a3421be9cc2deb6e2fe9f48b281ad0edc5a40430515c' 
  AND token = 'bQtZtz4ALiEPJt6Rj7OPttE2fA7fr75CTEEHL28jsPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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