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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c84788cdfc9aee3514d6fa2661c4ec3383f6451c3db48384b268222a79156c' 
  AND token = 'lr2UdSHUDq/+52camV0Lq+iFbKMd4n159y79B5wyobU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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