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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db6b365fdae359707532e6afc9f2c178b34436eab00cc7a709850205b8966a5' 
  AND token = 'U6olD1gUyF8MQWNl2j1ss5CW+RimURcuIE/QMwZAZB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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