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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c992e5135f47b7caf3616d766d6a6e84fad5f19586050f39fccc6687ec7f63db' 
  AND token = '5vX4AcchWv4DnZ1DWTQvg50x+iPS5dRCs3zed5AJ7S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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