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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392c30a1921fe7e5a62fedae587d1b11fb32718cf4a35d5d1d7857fc3bad89ae' 
  AND token = '6W9cqUgNj/CoLtBOaUBkCDL/NCMTR5eGlYdcJO9Fzic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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