Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71adb56ea80513ee8d4bb7b6766292d1f68fe9ad76de1aef508fe40851f8b011' 
  AND token = 'Zsvl8DqBVy+Lt+Sa1+z8O/JdJxgrZwe5zQRsdX6Oj8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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