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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e0c8fa0209213e523e825bbe7c48cfda7e33539bd9c1cb32043b725953c4ed' 
  AND token = 'oZcOGODUYvxTf0/R9t6Px6ZqIvOgz3z03EO3QIWev8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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