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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef7407128cfc97be2dae289214a884f9576290c624c3dbe8e0c8d1ccb3ecfdc' 
  AND token = 'zZoLqeW7O5Ojg+P83d2YbgG43yx/qgL7O8efoNeBy/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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