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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d2955c5ba114e1faa5df015d9685c1b5735d6130d53462fac8f856b6c92f4c' 
  AND token = 'XMuulstYeshsPMacftRqPlEyuTqz7A1TFrhF9eSB0fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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