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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1caced60712a7a298610f57089b6178a386e3f4e6ae06083a353e5675efd72b' 
  AND token = 'WiB6L6Om8NrxARGPl7CaHD/mKDoM0/7WCbLZQ29tXyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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