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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ff9fa35e8b3381a8fecdb4bd0c7792f88bc09cb9a3e3b954cbbfd8c046ecbe' 
  AND token = '6VZqrbyr5iPQcuPthT8lbLXlwlRiPqY6bcKlzx3Ge4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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