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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a43905d0fc190ebcad04f846fe176794e2a0d563507e80fb0417c782c65cbd' 
  AND token = 'Sd1x4/D+8EMkUiNFkvHJKnzNAi/juDC6d+adCEQn/yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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