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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3737a88366f7bbec87b862206130335daf7ee5c8c83a6062ee3bc5c965a130' 
  AND token = 'vLYrJk0z1d/T9q8WWnnMDVmrK6Lrk/xbW3U7IHNd960=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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