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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7308cdd39a7ef9aef7020c93960169d9a6cac2b24fe9d0619c26643cec0fd716' 
  AND token = '8rRAid3+nxFm9HmxOb3ZDXLZjaRGistprt73YChq6O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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