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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d66e33bac0ca1494cafc32e1c70f4bce06053841c6ae0696a04524fa78c4bd' 
  AND token = 'relEF9hLYaXj10Ym77sgjXVcg96YFWDnr3jurgkHuhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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