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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6534f735d9e6ba712c9e63a97cac0557478c747645fb099772f4818643051855' 
  AND token = '6oeXhyRMYLkYc/EOonRIpGkPoP6V8Y5TAw/QMuOiN/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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