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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed23b6aa34735caaea66f1ffb368ab11c35e7c2bd6aec89052331311e084e42' 
  AND token = 'dtNRJ02ksPcBZZTHfsu2Zlut45yFCaCboARDD3rqZJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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