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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0613218e79d3333beff7f78898d9d508111ea3208b2e307fc1ab3e252bf50cb' 
  AND token = 'wx/T7aIgSihWPnlTb3bwKtx8m/g3216xiHLrIAgDhh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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