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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '533b7e0ffc9781c0eb611ed438744a8e3df880db23000e07caae7ded33f8f88c' 
  AND token = 'qSf86DQgGBKmqOya/6SM1wkVJtgvgnj6fklnIGKz40w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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