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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccec8f759836409f4b478b6230018829df0cf6c6b3c7176b0a4e68d09f6f518' 
  AND token = 'BOF7ygrgztaNx6eiNsa4/9ixPK8bkkqeREx9i0XAUWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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