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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677371a9006ff71ebedd78471926524a7d93ad5957b990379191ea3d7891db11' 
  AND token = '4BoUrH+vx22YNiEmcMVs39Xv96k0cFvrDG54zGG8YoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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