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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab6d7708b7e3f42f0191067ec6a9ec59e122a336e610e62407957b5747e01ed' 
  AND token = 'Ojd5aWHVtNrA9u5k4VKlrDo7fWx/RhQaQukSZAtgJ6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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