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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998611c143760fcea86f181041d84a725298d8e549d89b0b08e195f0c0e6e334' 
  AND token = 'AR6PpLZL9f7R3zSk3kdLvB2vcChv5D02foUDmyv9iKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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