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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8400573aecfa098414ca9ea5d547a8802888ef56ecac03dbde1401bcc1192ab' 
  AND token = 'dwk6qS/t48wy+tYvaaDbhXoGNzhliECjMEtsMccmel8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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