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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b1553ccff2b2284381818c308cce1d9603471863c577cbd2110b5bf1c911ff' 
  AND token = '+L3q93igqGcZbRVGKncgIjEVI4UoTxNij54pfBzlrls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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