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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a384b17ec5acb722cdc7ad83c760369810415906f3cee93804a87434ee9c014a' 
  AND token = 'S7En5NZr0IttSGMtg2CE1lCgGVie9dTEnwtRCn1ms90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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