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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57853a7ee12d691ea8c8af0dc954a64a3214a03e6a50c23ba6211761f7a6c9fa' 
  AND token = 'cDVxl3Pd6CPre3+csTdVXIyN5TP6fI+hC8f6TRx8MgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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