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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4390c120748cc11a0b76edc0701a3fee5be960cc7aebe628d43e97496d482ffa' 
  AND token = 'CcylCVcVFj3ihl5kWq9eqE7/0P0OyGN02V2JhXvyvKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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