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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e98c291fb5cd0d66f0a7d0e64ef7e3510fe3ec28613fd2727acb7d5ef1746db' 
  AND token = 'cdTVepCJRVHoP6oHdXCVwbFFyXiXqKIqTIxBi3S6bv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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