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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b9396195a314a86c284384c7a0ef3d32eb53f284e8ee1a039ea9d8d75cafef' 
  AND token = 'VMXvl+IapS60xqA7jPi+ipJO/lbn5Uig/vj9VvdfAwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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