SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abeacd218b9e6594532c6c39d3937d4b3406755858cf683a7c442035c2c19a0a' 
  AND token = 'YRIK/a69gwvJNBamgeFa0hjjIf2UqkQP8FZGqsvxzxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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