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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ba2fd840474ff529e48fffdf50b03fe5d72f6cedcd4a5d77be8944a418dc78' 
  AND token = '8qbCltkeFrw+XAyAotidwZNHWxGSwYYfgMbOX8G7QFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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