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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470c645143459930651ec69ef9967e7fe0a17a756eea5044fac291a9720ca08f' 
  AND token = 'BbQt/c6DsZ3GtxjVzJE21wSFdhv7q+vvN3rlsq86I4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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