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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cd8d42d18b64ed610798a7da06cb99f74f19cc5a93212f9aef8e7164d3d05d' 
  AND token = 'Ae/zoypXrJTR7GX8piqEEvLuB7rUMun01iW7QsOMV40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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