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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb6e8cde408e78ab2ea725a4229bb74f7e64ea230fbe3c017231803c7c9d7cb' 
  AND token = 'o9WKY18ksn/f5aFlZmm/GsyFJjUk9Yqp/y8ACy//baE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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