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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3d6de89094988159fa35a4033de4036fbf9bbfc8f8bfd367967ec616a93922' 
  AND token = 'Uvi48QBtDQwp6y6+BBMS//J7p91kr3JFtk7UaVDjGIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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