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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00a0198d38f4f174c747ca5bc1d181de12b773aaa063455e0108c9f9ed137fa' 
  AND token = 'd5PqD4vQloBH7yiYxRgr+GxIB/7n6k97toAJaDcieYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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