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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca32dcfb034ef30cb68533a155959523229fe21b3ae8eb9458e5d4b6e02127d' 
  AND token = 'jsTLEeHSujuAFxObVgo6dkdSBE7XhSr8/f85JsX+Mbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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