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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1493809d9c6d6416244dbeefad594365c45f82929ca40772cb9d26f57d0c2984' 
  AND token = '+WJUJ8VolfnaD2zs2770HvXOJRLnygDpAF63yW2O86Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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