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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08d205ffb68f71469e46653fd2eacb5db363059f2d43960e5994ae5104250da' 
  AND token = 'zHehw6MY7Oj3f3ms3sNmM9Bl43ukxaoUc4gv6dml3W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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