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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9350dc4813e316d3593519feefbb149dc8d041d81c4b64bd5ae83acc88d9e2a2' 
  AND token = '3jKeCcz0cxfWqcFq3u4h5NiLGsqaFxYQXHGLbgo/H2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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