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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b2563b487e62a4175c9766eee5cb68e0bfb6b76745af264f6143535be15f2d' 
  AND token = '5b+Vacz6sYThUPjO0MEXIpcUgWQIL23ePLkV99GpUFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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